单项选择题

A．replaced
B．conducted
C．executed
D．proposed
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单项选择题
A．contributionB．deductionC．contemplationD．speculation
A．contribution
B．deduction
C．contemplation
D．speculation
单项选择题
According to the writer, it is difficult for you to go to sleep if ______.
A．you get the habit of staying up late
B．you haven't taken sleeping pills
C．you sleep for hours after dinner
D．you fail to do some exercises
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